ZOOLOGY AND BOTANY, MICROSCOPY, KTC. 467 



Dipneumoues such as Pholcus, e.g. in the bending of the caudal lobe 

 forwards. A tubercle on the internal surface of the pedipalps and limbs 

 recalls the masticating plates in Limning, (Jigantostraca, and Trilobites. 

 The complicated dorso-lateral plate, the origin of phagocytes, and other 

 subjects are discussed. The first cuticular envelope of the embryo differs 

 markedly from subsequent cuticles ; the chelicerae have chelre and the 

 other cephalothoracic limbs have distinct masticatory plates, whereas 

 the larva has no chehe and few setse. The ganglia in the cephalothorax, 

 which are described at length, show distinct internal cavities. The 

 development of the gut is described. The coxal gland opens behind the 

 first pair of appendages. 



Carboniferous Arachnida.* — R. I. Pocock has made an important 

 contribution to the study of the Carboniferous Arachnida. He deals 

 with thirty-three forms, some of which are of much morphological inte- 

 rest. Thus, a new scorpion, named Eobuthus holti, has bilobed over- 

 lapping plates on the fourth, fifth, and sixth somites of the abdomen, 

 which have a general resemblance to the gill-bearing appendages in the 

 same segments in the king-crab. 



Male Reproductive Organs of Chelifer and Chernss.t — J. P. 

 Schtschelkanowzew describes the internal male organs and the external 

 genitalia in the males of these two types, and discusses the systematic 

 position of the Ghelonethi in the system of Arachnids. His general 

 conclusion is that they are most nearly related to the sub-order Uro- 

 tricha (Holopeltidia). Among the many interesting facts brought out 

 in the memoir is the absence of a tail in the ripe spermatozoa. 



Sudanese Pycnogonids.J — G. H. Carpenter describes Nymphon 

 maculatum sp.n., marked from other species by the very elongate neck 

 and body, together with the short abdomen, excessively long second 

 coxal segment, and well-developed auxiliary claws ; and Pallenopsis 

 crosslandi sp.n., a very interesting species of a remarkable genus. There 

 are curious finger-like processes on the first tibial segment. These, 

 and indeed the legs generally, are beset with the prominent openings 

 of numerous cuticular glands, provided at the edge of the orifice with 

 small sharp spines. The elongate spines on the thigh and the first 

 tibial segment are highly denticulate. Another noteworthy feature is 

 the great length of the accessory claws, nearly equalling the principal 

 claw. The variation of this character in the genus Pallenopsis is 

 remarkable and instructive. 



New Decapod Pycnogonid.§— E. L. Bouvier describes Pentapyrnon 

 geayi sp.n. from off the coast of French Guiana. It has five pairs of 

 limbs — the first decapod Pycnogonid found outside the Antarctic region. 

 The new form is in several ways very interesting. Thus Bouvier points 



* Monograph of the Terrestrial Carboniferous Arachnida of Great Britain. 

 Paloeontographical Soc. (1911) 84 pp. (3 pis. and 42 figs.). 



t Festschrift Richard Hertwig, ii. (1910) pp. 1-38 (1 pi. and 5 figs.). 

 j Journ. Linn. Soc. (Zool.) xxxi. (1910) pp. 256-8 (1 pi.). 

 § Coniptes Rendus, clii. (1911) pp. 491-4. 



